@xiaolulu,
Thank you for the details; however, you didn’t answer my question. I need to make sure you’ve not tested the plugin with your account. So, you were waiting for an email from your email to your email, and the plugin worked correctly by not sending it.
The sender email address is the WordPress admin email address, this is the WordPress core feature. And the email of admin account in most cases is the same. So you should have guess that you trying to get notification from your email address to your email address. I assume this was the case.